<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style type="text/css">
        .container{
            height: 100%;
        }
        .left{
            float: left;
            width: 200px;
            height: 100%;
        }
        .center{
            margin: 0 20%;
            height: 300px;
            text-align: center;
        }
        .right{
            float: right;
            width: 200px;
            height: 100%;
        }
        img{
            border: black solid 1px;
        }
    </style>
</head>
<body>
<div class="container">
    <div class="left">
        <img src="../../homework12-01.png" width="100%" height="160">
    </div>
    <div class="right">
        <img src="../../homework12-02.png" width="100%" height="160">
    </div>
    <div class="center">三列圣杯布局
    </div>
</div>
</body>
</html>